🔍 Key Concepts

• Butterfly valve operation – how the disk moves relative to the flow • Quarter‑turn valves – examples and what they have in common (ball, plug, butterfly) • Typical advantages/limitations of butterfly valves in piping systems

💭 Think About

• Think about how far the handle or actuator must turn to move the disk from fully open to fully closed. • Consider whether butterfly valves are commonly used to regulate (throttle) flow, or only for fully open/fully closed service. • Ask yourself if there is anything about freshwater that would make it unsuitable or unsafe for a butterfly valve compared with other fluids.

✅ Before You Answer

• Identify whether a butterfly valve is a quarter‑turn valve or requires multiple turns like a gate or globe valve. • Decide if butterfly valves are capable of throttling flow, even if they may not be ideal for very fine control. • Check from basic piping practice whether butterfly valves are restricted from freshwater service, or if they are actually used in many water systems.